Why does downloading installation files fail when using the command prompt when connecting with a proxy? - Why does downloading installation files fail when using the command prompt when connecting with a proxy? Description If you are using a proxy to access the Internet, the command-line installer may fail unless you specify all of the following options for your proxy settings when installing Altera software: --proxyhost= <PROXYHOST> --username= <USERNAME> --password= <PASSWORD> PROXYHOST should be in the format of <HOST> : <PORT> . Additionally, you must specify one of the following options depending on which type of proxy you have: --proxy-basic --proxy-ntlm --proxy-digest For a complete list of options, please refer to Quartus® II Help . You can also include the --help option in the command prompt for a description of supported options. Resolution This problem is fixed beginning with the Quartus II software version 12.0. Related Articles How do I download and install the Altera software version 10.0 for Windows from the command line? How do I install the Quartus II software version 10.0 from the Windows command line without an Internet connection? Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 12.0 10.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']